251221252 has 12 divisors (see below), whose sum is σ = 441273420. Its totient is φ = 125143136.

The previous prime is 251221213. The next prime is 251221253. The reversal of 251221252 is 252122152.

251221252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 134235396 + 116985856 = 11586^2 + 10816^2 .

It is a super-2 number, since 2×251221252² = 126224234912895008, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (251221253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 115663 + ... + 117814.

It is an arithmetic number, because the mean of its divisors is an integer number (36772785).

Almost surely, 2^251221252 is an apocalyptic number.

It is an amenable number.

251221252 is a deficient number, since it is larger than the sum of its proper divisors (190052168).

251221252 is a wasteful number, since it uses less digits than its factorization.

251221252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233750 (or 233748 counting only the distinct ones).

The product of its digits is 800, while the sum is 22.

The square root of 251221252 is about 15849.9606308659. The cubic root of 251221252 is about 630.9846465406.

The spelling of 251221252 in words is "two hundred fifty-one million, two hundred twenty-one thousand, two hundred fifty-two".